Next Education India Private Limited — kotak credit card harassment calls

Address:

Sri Nilaya Cyber Spazio, 1 Floor, Rd#2, East Wing, Near Annapurna Studios, Banjara hills, Hyderabad, Andhra Pradesh, 500034

I paid my kotak mahindra bank credit card dues on time. It's already reflecting on the account. Even though i'm receiving some phone calls from various number's asking my credit card details and payment refference number. I have made the payment 4days before due date. I told them i'll not provide any details. I have made the payment in time. There no stopping them. Don't know how to get rid of those calls. Please help.